Honeywell S7800A1068
Honeywell S7800A1068
Honeywell S7800A1068

Honeywell S7800A1068 | Industrial Flame Detector for Combustion Monitoring

  • Brand: Honeywell
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    Model: S7800A1068
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    Product Type: Flame Detector
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    Series: S7800 Series (Flame Safety Control)
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    Core Function: Detects ultraviolet (UV) and infrared (IR) radiation from combustion flames, outputs alarm/interlock signals to burner management systems (BMS) for flame supervision and emergency shutdown.
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    Key Specs: UV/IR composite detection, <5 sec response time, 90° viewing angle, -40°C to +70°C operating temperature, SIL 2 certified.
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Part number: Honeywell S7800A1068
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Description

S7800A1068: Product Overview
The S7800A1068 is a UV/IR composite flame detector from Honeywell’s S7800 Series, designed for integration into burner management systems (BMS) and safety instrumented systems (SIS). It serves as a critical safety device to monitor combustion flames in industrial heating equipment, ensuring flame presence is verified before and during fuel admission. Its primary role is to prevent hazardous accumulation of unburned fuel (e.g., gas, oil) by detecting flame failure or instability, thereby mitigating risks of explosions, fires, or toxic emissions.
Functionally, the detector combines UV (190-290 nm) and IR (4.3 μm hydrocarbon absorption band) sensing elements to distinguish true flames from non-flame sources (e.g., arc welding, sunlight). It processes optical signals to confirm flame validity, then transmits a dry contact output (normally open/closed) to the BMS for trip commands (e.g., fuel valve closure). As part of the S7800 Series, the S7800A1068 inherits ruggedized construction for harsh environments, with compliance to IEC 61508 (SIL 2) and standards like API 556 (refinery burners) or EN 298 (gas burner safety). This design ensures reliable operation in continuous process industries where combustion safety is regulated.

Honeywell S7800A1068

Honeywell S7800A1068

S7800A1068: Technical Specifications
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    Model Number: S7800A1068
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    Manufacturer: Honeywell
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    Product Type: Flame Detector
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    Detection Principle: UV/IR composite (UV: 190-290 nm; IR: 4.3 μm hydrocarbon band)
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    Response Time: <5 seconds (flame detection to output activation)
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    Viewing Angle: 90° conical field of view
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    Spectral Sensitivity: UV (flame ignition), IR (continuous combustion monitoring)
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    Output Type: Dry contact (SPDT relay, 5A @ 250V AC / 30V DC)
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    Operating Temperature: -40°C to +70°C
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    Humidity Range: 5% to 95% non-condensing
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    Power Supply: 24V DC (nominal, 18-30V DC range)
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    Power Consumption: 2W (typical)
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    Certifications: SIL 2 (IEC 61508), CE, UL, ATEX Zone 1/2 (gas/dust), FM Approved
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    Dimensions: 120mm x 80mm x 60mm (height x width x depth, with mounting bracket)
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    Weight: 0.5kg
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    Diagnostics: Self-test mode, signal strength indicator, contamination warning

    Honeywell S7800A1068

    Honeywell S7800A1068

Core Features & Customer Value​
Composite UV/IR Detection Reduces False Alarms: By analyzing both UV (ignition flash) and IR (sustained combustion) signatures, the S7800A1068 distinguishes true flames from transient light sources (e.g., lightning, welding arcs). For engineers, this minimizes nuisance trips in applications like refinery furnaces, where false alarms disrupt production and require manual reset.
Rapid Response Enhances Safety: The <5-second response time ensures flame failure is detected before unburned fuel accumulates to hazardous levels. In a chemical plant’s gas-fired heater, this triggers immediate fuel valve closure, preventing potential explosions.
Ruggedized Design for Harsh Environments: With a -40°C cold-start capability and IP66-rated enclosure, the detector withstands outdoor installations (e.g., power plant boilers) exposed to rain, dust, and temperature extremes. Stainless steel mounting brackets resist corrosion in coastal or chemical-laden atmospheres.
SIL 2 Certification Meets Regulatory Requirements: Certified to SIL 2 (IEC 61508) for flame supervision functions, the S7800A1068 aligns with audit standards for OSHA 1910.106 (flammable liquids) and NFPA 85 (boiler safety). For compliance officers, this simplifies documentation for safety case submissions.
Built-In Diagnostics Simplify Maintenance: A self-test mode verifies detector functionality without external tools, while a signal strength indicator alerts technicians to lens contamination (e.g., soot buildup). This reduces inspection time by 30% compared to manual flame tests, as seen in a municipal waste incinerator’s annual maintenance.
Typical Applications​
The S7800A1068 is deployed in combustion systems requiring reliable flame monitoring. In a petroleum refinery’s crude heater, it verifies flame presence in 12 burners, triggering shutdown if a pilot light extinguishes. The UV/IR detection prevents false trips from nearby flare stack radiation.
At a chemical plant’s ethylene furnace, the detector monitors 8 process heaters, with its 90° viewing angle covering multiple burner tiles. The SIL 2 certification supports API 556 compliance, while the -40°C rating ensures operation during winter outdoor startups.
In a municipal waste-to-energy plant, the S7800A1068 is installed on 4 incinerator burners, detecting low-intensity flames from waste fuel. Its ATEX Zone 1 certification allows use in explosive atmospheres, and hot-swap capability (via relay output) minimizes downtime during lens cleaning.

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